Critical severity · published Jul 8, 2026
CVE-2026-54527
JupyterLab Git: Stored XSS leading to RCE
9.0
CVSS
0.5%
EPSS
No
On KEV
Description
JupyterLab Git is a Git extension for JupyterLab. From 0.30.0b3 before 0.54.0, the PlainTextDiff.ts createHeader() method passes Git filenames directly to innerHTML when rendering renamed files in commit history, allowing a crafted filename to execute JavaScript when a victim views the rename diff in the Git History tab. This issue is fixed in version 0.54.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JU
jupyterlab-git · jupyterlab
>= 0.30.0b3, < 0.54.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-54527
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-54527
Patch
https://github.com/jupyterlab/jupyterlab-git/commit/c6d37b88f36aa59aee317930b95e427fb9d6b09b
Release Notes
https://github.com/jupyterlab/jupyterlab-git/releases/tag/v0.54.0
Exploit
https://github.com/jupyterlab/jupyterlab-git/security/advisories/GHSA-f962-v9hr-pfg5
More from jupyterlab-git
7.1
CVE-2026-54528
jupyterlab-git excluded_paths Case-Sensitivity Bypass Allows Reading Excluded Directories